28 amps? Odd choice for output. Although there looks to be quite a bit of voltage drop even at that low setting so maybe they had to have it set to that to avoid issues.
Then again 28amps at 240v works out to 6,720 watts on paper. That's about the same as 32amps at 208v (6,656 watts). 208v is more typical in a commercial setting like a mall, so I'm surprised these are 240.
/edit. Although your battery is almost completely full in that image. Full to the point where even on AC charging you might be into the taper, hence the lower power setting.